Clear To Send: Wireless Network Engineering

Latest Episodes:

CTS 165: Ekahau Unveils New Products (Sponsored) Apr 09, 2019

Show notes

Ekahau Connect Jussi joins us on the show to talk about the latest announcement of Ekahau Connect and new products. Jussi has been on the show multiple times before: CTS 009: Jussi Kiviniemi of Ekahau CTS 069: Jussie of Ekahau CTS 109: Ekahau Sidekick, Spectrum Analysis, and Finnish Rap CTS 142: Jussi Kiviniemi Discusses the […]

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CTS 164: 802.11ax Target Wake Time Apr 02, 2019

Show notes

Objectives of TWT Objectives of 802.11ax All the current power saving mechanisms defined today remain usable with ax. In addition, the 802.11ax draft defines a new mechanism called Target Wake Time or TWT. Target wake time (TWT) is used to help minimize contention between clients and reduce the amount of time a client in power […]

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CTS 163: Cisco 802.11ax APs & Cisco Live Mar 25, 2019

Show notes

Cisco Live We have an episode full of Cisco goodness. Recently, Cisco released the data sheets to two 802.11ax access points. We have the details on these two APs, their capabilities, and some of our opinions. And speaking of Cisco, right around the corner is Cisco Live. We have our tips and the sessions we’re […]

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CTS 162: 802.11ax OFDMA Subcarriers Mar 18, 2019

Show notes

With OFDMA in 802.11ax, the size of the subcarriers has been divided by 4. Going from 312.5KHz wide with OFDM to 78.125KHz wide. The symbol duration has been increased by 4 times in the meantime. Going from 3.2 microseconds with OFDM to 12.8 microseconds. View the full image here Advantages of having more subcarriers Allow […]

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CTS 161: 802.11ax BSS Coloring Mar 04, 2019

Show notes

Why is there a need for BSS Coloring? To help a receiving device identify the BSS from which a receiving PPDU originates from so that there’s a reduction in BSS collision reporting a busy medium. 802.11ax allows the medium to be reused more often between OBSSs by identifying those overlapping BSSs. The primary purpose is […]

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CTS 160: 802.11ax OFDMA Resource Units Feb 25, 2019

Show notes

802.11ax (Wi-Fi 6) brings OFDMA to wireless. It’s an enhancement over OFDM which was a single-user transmission. When a signal is sent or received it is done with one device. In OFDMA, it allows multiple access which means simultaneous transmissions to/from multiple devices. There is a downlink multi-user operation and an uplink multi-user operation. In […]

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CTS 159: Wi-fi 6 (802.11ax) Overview Feb 11, 2019

Show notes

I decided to finally get myself a little familiar with 802.11ax. I’m not sure why but I’ve pretty much ignored it until now. In this episode, I’m going to provide my overview of 802.11ax, or Wi-Fi 6. This episode will be the start of a mini series diving into detail of the components of 802.11ax. […]

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CTS 158: 802.11w – Management Frame Protection Feb 04, 2019

Show notes

802.11w applies to robust management frames protected by Protected Management Frame (PMF). Wireless environment includes: Rogues Susceptible to eavesdropping Data traffic is usually encrypted Management frame is usually unencrypted Goal of 802.11w is to protect management frames from forgery or spoofing. I see it all the time in San Francisco. Deauthentication attacks coming left, right, […]

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CTS 157: The effect of rate limiting on Wi-Fi Jan 28, 2019

Show notes

Welcome to a new episode where we speak with Troy Martin. We’re following his presentation at WLPC Prague, Effects of Rate Limiting on Wi-Fi Flow. We ask Troy to go into more detail about rate limiting and the effect it has on Wi-Fi. Effect Of Rate Limiting on Wi-Fi Users often goes around obstacles. What […]

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CTS 156: 802.11 Service Sets Jan 21, 2019

Show notes

802.11 has different topologies to be aware of. They describe how 802.11 radios may be used to communicate with each other. Many are familiar with the most common ones such as BSS and ESS. But additionally, a client can operate in an IBSS, PBSS, and MBSS. IBSS: Independent Service Set BSS: Basic Service Set ESS: […]

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